CVE-2026-1245 in binary-parser
Summary
by MITRE • 01/20/2026
A code injection vulnerability in the binary-parser library prior to version 2.3.0 allows arbitrary JavaScript code execution when untrusted values are used in parser field names or encoding parameters. The library directly interpolates these values into dynamically generated code without sanitization, enabling attackers to execute arbitrary code in the context of the Node.js process.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 01/27/2026
The vulnerability identified as CVE-2026-1245 represents a critical code injection flaw within the binary-parser library affecting versions prior to 2.3.0. This issue stems from inadequate input validation and sanitization mechanisms that permit untrusted data to be directly interpolated into dynamically generated JavaScript code. The flaw manifests when developers utilize user-supplied values in parser field names or encoding parameters, creating a pathway for malicious actors to inject arbitrary code that executes within the Node.js process context. The binary-parser library serves as a utility for parsing binary data structures, making this vulnerability particularly dangerous as it can be exploited during legitimate data processing operations. The vulnerability aligns with CWE-94, which categorizes improper control of generation of code, and represents a classic example of unsafe dynamic code generation where external inputs are directly incorporated into executable code without proper sanitization.
The technical exploitation of this vulnerability occurs through the manipulation of parser field names and encoding parameters that are subsequently used to construct dynamic code segments. When the library processes these inputs, it directly interpolates them into code generation templates without implementing any form of input sanitization or validation. This creates a scenario where an attacker can inject malicious JavaScript code that gets executed as part of the parsing operation, effectively allowing remote code execution within the Node.js environment. The attack vector is particularly insidious because it can be triggered through normal usage patterns of the library, requiring no special privileges or complex exploitation techniques. The vulnerability demonstrates a fundamental flaw in the library's architecture where dynamic code generation is performed without proper security controls, enabling attackers to manipulate the parsing process and gain arbitrary code execution capabilities. This issue is further exacerbated by the fact that the malicious code executes with the same privileges as the Node.js process, potentially allowing attackers to access system resources, read/write files, or perform other malicious activities.
The operational impact of CVE-2026-1245 extends beyond simple code execution, as it fundamentally compromises the security posture of applications that rely on the affected binary-parser library. Systems using vulnerable versions could experience complete compromise, with attackers potentially gaining persistent access to server environments and the ability to escalate privileges. The vulnerability affects applications across multiple domains including web servers, data processing systems, and network applications that handle binary data parsing. Organizations may face significant security breaches, data loss, and compliance violations as a result of exploitation. The widespread use of parsing libraries in Node.js applications means that this vulnerability could affect numerous applications across different industries, from financial services to healthcare and government sectors. The vulnerability's impact is amplified by the fact that it can be exploited through simple input manipulation, making it accessible to attackers with varying skill levels and potentially leading to widespread compromise across multiple systems.
Mitigation strategies for CVE-2026-1245 center on immediate version upgrades to 2.3.0 or later, which contain the necessary patches to address the code injection vulnerability. Organizations should conduct comprehensive vulnerability assessments to identify all applications using the affected library and prioritize remediation efforts. Additional defensive measures include implementing strict input validation and sanitization for all parser parameters, utilizing runtime code analysis tools to detect suspicious code patterns, and employing application whitelisting techniques to restrict code generation. Security monitoring should be enhanced to detect anomalous parsing behavior that might indicate exploitation attempts. The vulnerability highlights the importance of following secure coding practices such as those outlined in the OWASP Secure Coding Practices, particularly regarding dynamic code generation and input handling. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation. Regular security audits and dependency monitoring are essential to prevent similar vulnerabilities from emerging in other components of the application stack. The ATT&CK framework categorizes this vulnerability under T1059.007 for JavaScript and T1068 for exploit for privilege escalation, emphasizing the need for comprehensive defensive strategies that address both the initial compromise and potential post-exploitation activities.